package com.xiaohe.service;

import com.alibaba.fastjson.JSON;
import com.xiaohe.pojo.Content;
import com.xiaohe.utils.HtmlParseUtil;
import com.xiaohe.utils.R;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 功能描述
 *
 * @author 和振斌
 * @date 2020/9/25
 * @return
 */
@Service
public class ContentService {


    @Autowired
    private RestHighLevelClient restHighLevelClient;


    //解析数据放入es索引中
    public Boolean parseContent(String keywords) throws IOException {
        List<Content> contents = new HtmlParseUtil().parseJD(keywords);

        //将查询的数据放入es库中
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("2m");
        for (int i = 0; i < contents.size(); i++) {

            bulkRequest.add(new IndexRequest("jd_goods")
            .id(""+(i+1))
            .source(JSON.toJSONString(contents.get(i)), XContentType.JSON));
        }
        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        System.out.println(bulk.status());
        return !bulk.hasFailures();

    }

    //获取数据
    public List<Map<String,Object>> searchPage(String keywords, int pageNo, int pageSize) throws IOException {
        if(pageNo<=1){
            pageNo=1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keywords);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //执行搜索
      searchRequest.source(sourceBuilder);
        SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    //解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : search.getHits().getHits()) {
             list.add(hit.getSourceAsMap());
        }

        return list;
    }

    //高亮显示
    public List<Map<String,Object>> searchPageByHighLight(String keywords, int pageNo, int pageSize) throws IOException {
        if(pageNo<=1){
            pageNo=1;
        }
        //条件搜索
        SearchRequest searchRequest = new SearchRequest("jd_goods");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        //分页
        sourceBuilder.from(pageNo);
        sourceBuilder.size(pageSize);

        //精准匹配
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keywords);
        sourceBuilder.query(termQueryBuilder);
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

        //高亮
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.requireFieldMatch(false);
        highlightBuilder.preTags("<span style='color:red'>");
        highlightBuilder.postTags("</span>");
        sourceBuilder.highlighter(highlightBuilder);

        //执行搜索
        searchRequest.source(sourceBuilder);
        SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        //解析结果
        ArrayList<Map<String,Object>> list = new ArrayList<>();
        for (SearchHit hit : search.getHits().getHits()) {

            //解析高亮的字段
            //1.获取高亮的字段
            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
            HighlightField title = highlightFields.get("title");
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();//原来的结果

            //2.解析高亮字段
            if(title!=null){
                Text[] fragments = title.fragments();
                String n_title="";
                for(Text fragment : fragments) {
                    n_title+=fragment;
                }
                sourceAsMap.put("title",n_title);
            }
            list.add(hit.getSourceAsMap());
        }

        return list;
    }
}
